1. superlative form of duff; most ineffectual, incompetent, or of poor quality
Usage: informal; chiefly British

Examples

• That was the duffest performance I've ever seen from the team.
• He's the duffest player on the roster.
• The duffest excuse won't get you out of trouble this time.
• Of all the attempts, that one was the duffest.
• She gave the duffest presentation at the conference.